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Soda-Lime (Float) Glass

Soda-lime glass is a glass-type material. It has two common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare soda-lime glass to other glass and glass-ceramics (top) and the entire database (bottom).

Elastic (Young's, Tensile) Modulus

70 to 71 GPa 10 x 106 psi

Knoop Hardness


Poisson's Ratio


Shear Modulus

29 GPa 4.1 x 106 psi

Strength to Weight Ratio

17 to 72 kN-m/kg

Tensile Strength: Ultimate (UTS)

41 to 180 MPa 5.9 to 25 x 103 psi

Thermal Properties

Specific Heat Capacity

720 to 800 J/kg-K 0.17 to 0.19 BTU/lb-°F

Thermal Conductivity

1.0 to 1.1 W/m-K 0.58 to 0.61 BTU/h-ft-°F

Thermal Diffusivity

0.51 to 0.6 m2/s

Thermal Expansion

8.8 to 9.0 µm/m-K

Other Material Properties


2.4 g/cm3 150 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz

7.3 to 7.4

Dielectric Strength (Breakdown Potential)

13 kV/mm 0.51 V/mil

Light Transmission Range

0.35 to 2.5 µm

Refractive Index


Followup Questions

Variant Materials

Further Reading

Dictionary of Glass: Materials and Techniques, Charles Bray, 2002

Glass Construction Manual, Christian Schittich et al., 1999

Glass: Mechanics and Technology, Eric Le Bourhis, 2007